Hippus
Hippus
Hippus (pronounced: /ˈhɪpəs/) is a medical term that refers to the rhythmic dilation and constriction of the pupil of the eye, often observed in certain neurological or ophthalmological conditions.
Etymology
The term 'Hippus' is derived from the Greek word 'hippos', meaning horse. It is so named because the movement of the pupil during hippus is reminiscent of the rhythmic movement of a galloping horse.
Description
Hippus is characterized by rhythmic, bilateral, and usually synchronous changes in pupil size. These changes are not associated with changes in illumination or fixation distance. Hippus is often associated with certain neurological conditions such as Parkinson's disease, Multiple sclerosis, and Lyme disease. It can also be observed in healthy individuals under certain conditions, such as fatigue or concentration.
Related Terms
- Pupil: The circular opening in the center of the eye that allows light to enter.
- Pupillary light reflex: The reduction in pupil size in response to light.
- Miosis: The constriction of the pupil.
- Mydriasis: The dilation of the pupil.
- Anisocoria: A condition characterized by an unequal size of the eye's pupils.
See Also
External links
- Medical encyclopedia article on Hippus
- Wikipedia's article - Hippus
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